holmes tried to join a gun club, just last month. the owner says when he tried to follow up, he got a bizarre voice mail message and told employees not to let holmes in, without checking with him first. >> the voice mail was a very low base, guttural-sounding, rambling, incoherent deal that was strange, bizarre, a little freakish. >> 12 people were killed, 58 wounded in this tragedy. 25 people, this morning, still in the hospital. nine remain in critical condition. and it's hard to imagine, but things could have been even worse. the shooter's gun, a civilian version of an m-16, jammed. otherwise, he might have been able to fire even more bullets from a 100-round drum. and now we're hearing that quick-thinking police who responded to the scene could have mistaken the shooter for one of their own, but they knew something was off. >> he's dressed like a s.w.a.t. member. >> these guys were sharp enough to see that the outfit wasn't quite right and they immediately challenged him. >> thousands gathered last night for a vigil for the victi